US3740059A - Water pump seal - Google Patents

Water pump seal Download PDF

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Publication number
US3740059A
US3740059A US00234873A US3740059DA US3740059A US 3740059 A US3740059 A US 3740059A US 00234873 A US00234873 A US 00234873A US 3740059D A US3740059D A US 3740059DA US 3740059 A US3740059 A US 3740059A
Authority
US
United States
Prior art keywords
face
seal
seal member
case
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00234873A
Other languages
English (en)
Inventor
M Witzenburg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Application granted granted Critical
Publication of US3740059A publication Critical patent/US3740059A/en
Assigned to CATERPILLAR INC., A CORP. OF DE. reassignment CATERPILLAR INC., A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CATERPILLAR TRACTOR CO., A CORP. OF CALIF.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/38—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member sealed by a packing

Definitions

  • ABSTRACT A water pump seal including a lip-type sealing member maintained in a sealing position to a containing case and engaging the outer periphery of a cylindrical face seal member for the purpose of providing a pressure balance sea] by eliminating the communication of water pressure to the rear face of the face seal member.
  • the face seal member is held concentric with a shaft to be received by the seal and restrained from rotation by a spring pressing against the face seal member at one end and the case at its other end as well as by a resilient lip-type seal bearing against the face seal circumference.
  • Such manner of rotation restraint and the use of a lip-type sealing member further contribute to increased seal life.
  • Water pump shaft seals in use today generally employ a face seal member in conjunction with a bellows and spring to effect a seal between a rotating shaft and a housing.
  • Such seals are usually provided in the form of a cartridge or package-type assembly prefabricated at the factory in order that actual installation of the seal in mechanical equipment may be made with a minimum of effort and skill on the part of the operator.
  • an annular cup or case serves as a container for the face seal member, spring, and bellows, and is adapted for press fitting engagement in a recess of the housing, with the central opening through the case accommodating the rotary shaft.
  • the face seal member is positioned at the forward end of the case, and the spring is disposed to act between a rear end wall of the case and the face seal member so as to resiliently urge the latter axially against a hub of the shaft when the assembly is installed to effect a rotary seal therewith.
  • the bellows is disposed coaxially outward of a central tubular portion of the case which inwardly defines the shaft accomodating opening thereof.
  • One end of the bellows is fixedly secured, or staked to the face seal member, and the other end of the bellows is conventionally fixedly secured to the case.
  • the usual practice is to provide a plurality of lug members on the tubular hub portion of the case to slidably engage concave surfaces formed on'the inner surface of the face seal member.
  • the conventional water pump seal design hereinbefore described presents a number of disadvantages making it difficult to achieve a long service life.
  • Rotation of the water pump shaft applies a certain amount of torque to the face seal member forcing it to circumferentially engage the case hub lug members to prevent rotation. Overa period of time the face seal member wears the lugs and vice versa.
  • the seal member may wear through the lugs in which case the seal member is prevented from fully engaging the sealing member of the pump shaft, thereby creating a leak.
  • the concave locking surfaces of the face seal member may be rounded out, permitting the seal member to rotate and twist the bellows. The bellows will usually tear, thus causing another leak path.
  • the general object of the present invention is to provide a water pump seal of the cartridge or package type wherein communication of water pressure to the rear face of the dynamic face seal member is eliminated to provide a pressure balance seal having a relatively long operating life.
  • a lip-type static sealing member and non-engaging securing means for restraining the dynamic face seal member against rotation are incorporated into the seal to further enhance the operating life thereof.
  • the seal of the present invention basically includes a lip-type static sealing member restrained in a sealing position to a containing case and engaging the outer periphery of a cylindrical tubular dynamic face seal member traversable by the shaft of a water pump and having a rim face sealably engageable with a hub portion of the shaft.
  • the face seal member is held concentric with the shaft, resiliently loaded against the hub, and restrained from rotation by a compression spring pressing against the face seal member at one end and against the case at its other end.
  • a lip-type sealing member bears against the periphery of the dynamic face seal to further restrain its rotation.
  • the lip-type sealing member eliminates communication of water pressure to the rear face of the face seal member to thereby provide a relatively simple design.
  • FIGURE is a sectional view taken at a diametric plane through a seal in accordance with the present invention, the seal being depicted in operable position installed within a water pump housing and receiving the rotary shaft of the pump.
  • the seal 17 includes a generally cylindrical cupped case 18 having a coaxial circular opening 19 in the base end wall 20 thereof.
  • the opening 19 terminates in a lip or flange 21 that turns inwardly of seal 17 and concentrically for a short distance with shaft 11.
  • the peripheral wall 22 of the case is outwardly flared at its end to define an annular flange 23 for support of the case against the housing wall when inserted into the bore 14.
  • the shaft 11 coaxially traverses the opening 19 with its lip 21, and a cylindrical tubular dynamic face seal member 24 having an end rim face 26 engaging the seal face 13 of shaft hub 12 is supported concentric with respect to the shaft by means of a helical compression spring 27 disposed between the opposite end face 28 of member 24 and the base end wall 20 of the case.
  • the spring serves to resiliently load the seal member 24 against the face seal of the hub.
  • the spring is preferably also employed to restrain the seal member against rotation with the shaft.
  • the opposite ends of the spring are resiliently pressed against the seal member end face 28 and the case wall 20.
  • the spring 27 produces at least partial rotation restraint of seal 24 without requirement of interengaging portions of the seal member and case which tend to shorten seal life.
  • a tubular generally cylindrical lip-type static sealing member 29 Disposed coaxially outward of the face seal member 24 and spring 27 there is provided a tubular generally cylindrical lip-type static sealing member 29.
  • the sealing member 29 is formed at one end with an outwardly flared portion 31 which is molded to an intermediate outwardly stepped radial shoulder 32 of the case 18 and is preferably also molded over flange 23 and the upper end of the peripheral wall of the case. The outer surface of the molded portion 31 then engages the wall of bore 14 to sealably retain the case in position therein.
  • the opposite end of the sealing member 29 is formed with an inwardly flared annular lip 33 engaging the outer peripheral wall of face seal member 24 along a seal surface 35.
  • the outer surface of sealing member 29 is provided with a circumferential groove 34 adjacent the lip 33 in opposition to surface 35 for receiving a garter spring 36 or the like which serves to urge the lip into sealing engagement with the seal member 24.
  • the sealing member 29 eliminates the communication of water pressure from the interior of the pump housing 16 to the rear face of the dynamic face seal member 24, thereby providing a pressure balanced seal having materially increased life.
  • the pressure balanced seal is of relatively simple design compared to previous balanced seals which are relatively complex.
  • the face seal member 24 is cylindrical in shape, it is longer lived, easy to produce and of low cost compared to conventional seals which typically have a shoulder machined or molded to them for the purpose of restraining the bellows and applying spring force.
  • a rotary seal comprising a substantially cylindrical cupped case having a coaxial circular opening in a base end wall thereof for traversal by a rotary shaft, said case being adapted for mounting within a bore of a housing, a cylindrical tubular dynamic face seal member disposed coaxially of said case for traversal by said shaft and having an end rim face for sealably engaging a seal face ofa hub carried by said shaft, a compression spring coaxial with said shaft and acting between said base end wall of said case and a second opposite end rim face of said face seal member for coaxially resiliently urging said first end rim face into sealed engagement with said seal face of said hub, means formed into the base end wall of said case to position said spring coaxially with said shaft, and a tubular substantially cylindrical lip-type static sealing member disposed coaxially outward of said face seal member having a first end sealably molded to the peripheral wall of said case and second opposite end formed with an inwardly flared annular lip in slidable sealing engagement with the outer peripheral wall of said face seal member to

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Sealing (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00234873A 1972-03-15 1972-03-15 Water pump seal Expired - Lifetime US3740059A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US23487372A 1972-03-15 1972-03-15

Publications (1)

Publication Number Publication Date
US3740059A true US3740059A (en) 1973-06-19

Family

ID=22883172

Family Applications (1)

Application Number Title Priority Date Filing Date
US00234873A Expired - Lifetime US3740059A (en) 1972-03-15 1972-03-15 Water pump seal

Country Status (3)

Country Link
US (1) US3740059A (fr)
JP (1) JPS491936A (fr)
BE (1) BE796012A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29716258U1 (de) * 1997-09-10 1997-11-06 Depac Dichtungstechnik Gmbh, Bludenz Gleitringdichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2195877A (en) * 1936-04-08 1940-04-02 Curtis Mfg Co Shaft sealing device
US2467239A (en) * 1945-07-30 1949-04-12 Crane Packing Co Bellows shaft seal protector
US2856219A (en) * 1954-07-07 1958-10-14 Victor Mfg & Gasket Co Fluid seal
US3022081A (en) * 1957-08-01 1962-02-20 Victor Mfg & Gasket Co Self-contained fluid seal
AT226082B (de) * 1960-05-18 1963-02-25 Bofors Ab Achsendichtung, insbesondere für Kraftfahrzeuge
US3669458A (en) * 1970-09-25 1972-06-13 Caterpillar Tractor Co Water pump seal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2195877A (en) * 1936-04-08 1940-04-02 Curtis Mfg Co Shaft sealing device
US2467239A (en) * 1945-07-30 1949-04-12 Crane Packing Co Bellows shaft seal protector
US2856219A (en) * 1954-07-07 1958-10-14 Victor Mfg & Gasket Co Fluid seal
US3022081A (en) * 1957-08-01 1962-02-20 Victor Mfg & Gasket Co Self-contained fluid seal
AT226082B (de) * 1960-05-18 1963-02-25 Bofors Ab Achsendichtung, insbesondere für Kraftfahrzeuge
US3669458A (en) * 1970-09-25 1972-06-13 Caterpillar Tractor Co Water pump seal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29716258U1 (de) * 1997-09-10 1997-11-06 Depac Dichtungstechnik Gmbh, Bludenz Gleitringdichtung

Also Published As

Publication number Publication date
JPS491936A (fr) 1974-01-09
BE796012A (fr) 1973-08-27

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Legal Events

Date Code Title Description
AS Assignment

Owner name: CATERPILLAR INC., A CORP. OF DE.,ILLINOIS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515

Owner name: CATERPILLAR INC., 100 N.E. ADAMS STREET, PEORIA, I

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CATERPILLAR TRACTOR CO., A CORP. OF CALIF.;REEL/FRAME:004669/0905

Effective date: 19860515